Abstract
It is shown that the emptiness problemfor two-pebble automata languages is undecidable and that two-pebble automata are weaker than three-pebble automata.
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It is shown that the emptiness problemfor two-pebble automata languages is undecidable and that two-pebble automata are weaker than three-pebble automata.
View all access options for this article.